Pressure control for pneumatic tires



June 11, 1935. L/M. MERCIER PRESSURE CONTROL FOR PNEUMATIC TIRES Filed. Dec. 15, 1932' [22 V822 for I LbzzzkMarceZ/Vemzr A 5 0212 qy:

4 l I I I 1 I I l I I I 1 I r I I I I l I 1 I I Patented June 11, 1935 it UNITED STATES PATENT OFFICE PRESSURE CONTROL FOR PNEUMATIC TIRES Louis Marcel Mercier, Neuilly-sur-Seine, France Application December 15, 1932, Serial No. 647,445

In Belgium October 27, 1932 I 1 Claim. (Cl. 152-11.5)

The present invention relates to pressure conment with valve c (Fig. 2), abutment h serving trols for pneumatic tires. to arrest said valve, while spring i acts to main- One of the objects of the present invention tain the same in centred position; air will then is to provide a compact assemblywhich may be escape through the interspace between elements 5 permanently attached to, or formed integrally e and f and, in passing through orifice 7, will 5 with, the valve of a pneumatic tire and which produce a warning sound. prevents the air pressure inside the tire from ex- The variant shown in Fig. 3 difiers from the ceeding a predetermined value. device above described only in the design of ele- Other objects will appear in the course of the ment e and h which are, here, made integral L0 detailed description now to be given with ref.- with one another, valve e being then immovable 10 erence to the accompanying drawing, in which: and spring 2' being eliminated;- This form of de- Fig. l is an axial section through one ilvice operates substantially m the same manner lustrative embodiment of the invention; as the one shown in Figs. 1 and 2, except that Fig. 2 represents the device shown-in Fig. 1, piston I alone responds to pressure. during a different phase in the operation thereof; From the foregoing, it will be seen that each Fig. 3 shows, in section, a second form of the tire will be equipped to prevent pressures in the invention. imier tube exceeding a predetermined value fixed Referring to Figs. 1 and 2 of the drawing, by spring 9 and that no pressure gauge or equivathere is shown an assembly composed of the follent need be used when inflating a tire. g0 lowing 'elzments. A tubular stem (1'- (straight or What I claim is:- bent) such as is usually attached to inner tubes; A safety valve for use in connection with a a casing b threadedly engaging with element a; pneumatic tire valve device including a valve a valve rod a forming part of the usual type of stem, a vale in said stem and a valve rod projectvalve coacting with tube a; a cylinder d threadeding from said valve stem, which comprises, in :35 ly engaging with casing t at one extremity; a combination, a casing having a screw threaded valve e provided with a bevelled peripheral seat; bore for connecting it to the inlet end of said valve a hollow piston J slidably' contacting with cylstem, a tubular air inlet extension carried by inder d and provided with a bevelled seat adapted said casing and adapted to receive slidably the to coact with valve e; a spring 9 opposing moveend of said valve rod, a cylinder opening at one 34) ment of piston I; an abutment h integral with end into said casing and rigidly fixed thereto,

the bottom of cylinder d; a spring 1' adapted to said cylinder being provided with a hole in its center valve e when the latter is out of contact intermediate wall so as to connect its inside with piston f; and a bevelled passage 7' adapted to with the atmosphere, a piston slidably mounted function as a whistle. in said cylinder provided with an opening ex- The hereinabove described assembly operates tending therethrough, a valve mounted in said as follows when an air supply nozzle is applied opening, elastic means adapted to act on said to the open end of casing b, valve rod a will piston for resisting the action of the air pressure move inward and unseat the valve attached in said casing thereon, and an abutment rigidly thereto; air will then pass into the inner tube carried by said cylinder and mounted to contact 40 in the usual way; but when the pressure inside with saidvalve when the piston has moved a 40 the latter reaches a predetermined value fixed predetermined distance in the cylinder under the by spring a, the air in chamber 0 will react on action of the air pressure in the casing. piston I so as to move the latter out of engage- LOUIS MARCEL MERCIER. 

